- if (left) { // move to leftmost position
- // if this is an RTL paragraph, and we're at the last row in the
- // paragraph, move to lastpos
- if (par.isRTL(buf.params()) && row.endpos() == lastpos())
- pos() = lastpos();
- else {
- pos() = bidi.vis2log(row.pos());
-
- // Moving to the leftmost position in the row, the cursor should
- // normally be placed to the *left* of the leftmost position.
- // A very common exception, though, is if the leftmost character
- // also happens to be the separator at the (logical) end of the row
- // --- in this case, the separator is positioned beyond the left
- // margin, and we don't want to move the cursor there (moving to
- // the left of the separator is equivalent to moving to the next
- // line). So, in this case we actually want to place the cursor
- // to the *right* of the leftmost position (the separator).
- // Another exception is if we're moving to the logically last
- // position in the row, which is *not* a separator: this means
- // that the entire row has no separators (if there were any, the
- // row would have been broken there); and therefore in this case
- // we also move to the *right* of the last position (this indicates
- // to the user that there is no space after this position, and is
- // consistent with the behavior in the middle of a row --- moving
- // right or left moves to the next/previous character; if we were
- // to move to the *left* of this position, that would simulate
- // a separator which is not really there!).
- // Finally, there is an exception to the previous exception: if
- // this non-separator-but-last-position-in-row is an inset, then
- // we *do* want to stay to the left of it anyway: this is the
- // "boundary" which we simulate at insets.
- // Another exception is when row.endpos() is 0.
-
- // do we want to be to the right of pos?
- // as explained above, if at last pos in row, stay to the right
- bool const right_of_pos = row.endpos() > 0
- && pos() == row.endpos() - 1 && !par.isInset(pos());
-
- // Now we know if we want to be to the left or to the right of pos,
- // let's make sure we are where we want to be.
- bool const new_pos_is_RTL =
- par.getFontSettings(buf.params(), pos()).isVisibleRightToLeft();
-
- if (new_pos_is_RTL != right_of_pos) {
- ++pos();
- boundary(true);
- }
- }
- } else {
- // move to rightmost position
- // if this is an LTR paragraph, and we're at the last row in the
- // paragraph, move to lastpos
- if (!par.isRTL(buf.params()) && row.endpos() == lastpos())
- pos() = lastpos();
- else {
- pos() = row.endpos() > 0 ? bidi.vis2log(row.endpos() - 1) : 0;
-
- // Moving to the rightmost position in the row, the cursor should
- // normally be placed to the *right* of the rightmost position.
- // A very common exception, though, is if the rightmost character
- // also happens to be the separator at the (logical) end of the row
- // --- in this case, the separator is positioned beyond the right
- // margin, and we don't want to move the cursor there (moving to
- // the right of the separator is equivalent to moving to the next
- // line). So, in this case we actually want to place the cursor
- // to the *left* of the rightmost position (the separator).
- // Another exception is if we're moving to the logically last
- // position in the row, which is *not* a separator: this means
- // that the entire row has no separators (if there were any, the
- // row would have been broken there); and therefore in this case
- // we also move to the *left* of the last position (this indicates
- // to the user that there is no space after this position, and is
- // consistent with the behavior in the middle of a row --- moving
- // right or left moves to the next/previous character; if we were
- // to move to the *right* of this position, that would simulate
- // a separator which is not really there!).
- // Finally, there is an exception to the previous exception: if
- // this non-separator-but-last-position-in-row is an inset, then
- // we *do* want to stay to the right of it anyway: this is the
- // "boundary" which we simulate at insets.
- // Another exception is when row.endpos() is 0.
-
- // do we want to be to the left of pos?
- // as explained above, if at last pos in row, stay to the left,
- // unless the last position is the same as the first.
- bool const left_of_pos = row.endpos() > 0
- && pos() == row.endpos() - 1 && !par.isInset(pos());
-
- // Now we know if we want to be to the left or to the right of pos,
- // let's make sure we are where we want to be.
- bool const new_pos_is_RTL =
- par.getFontSettings(buf.params(), pos()).isVisibleRightToLeft();
-
- if (new_pos_is_RTL == left_of_pos) {
- ++pos();
- boundary(true);
- }
- }
- }